CFD simulation of vortex-induced vibration of an elastic cylinder in subcritical flow regime using a two-way coupled model validated by experiment

Abstract

The vortex-induced vibration (VIV) responses of an elastic cylinder have been numerically investigated using the two-way fluid-structure interaction model. The crossflow displacement (y) responses obtained from experiments agree well with that the results obtained from the numerical simulation. Further, the parametric study has been carried out on an elastic cylinder for various reduced velocities (Vr) ranging from 6.25 to 15.00 with an aspect ratio (L/D) of 100 using two way coupled model. The higher-order frequency components were observed in the force coefficients except for Vr of 13.13. In contrast, only a single frequency component was observed in both crossflow and inline displacements, except for Vr of 15.00 in inline response. The infinite lock-in was observed for the crossflow amplitude responses in the Vr range of 6.25–15.00. The finite lock-in was observed in the inline amplitude responses in the Vr range of 6.25–15.00 and reached the maximum amplitude in the Vr range of 9.88–11.49, where the drag force first frequency component is synchronized with the structure's second natural frequency and then decreases up to Vr of 15.00. The drag force frequency component follows harmonics in the limited range of Vr 6.25 to 9.59.